Disable mmap in libbacktrace on Apple platforms

Fixes #45731

libbacktrace uses mmap if available to map ranges of the files containing debug information. On macOS `mmap` will succeed even if the mapped range does not exist, and a SIGBUS (with an unusual EXC_BAD_ACCESS code 10) will occur when the program attempts to page in the memory. To combat this we force `libbacktrace` to be built with the simple `read` based fallback on Apple platforms.

src/libbacktrace/configure

@@ -12323,6 +12323,12 @@ fi
 
  fi
 fi
+
+case "${host_os}" in
+darwin*)
+ have_mmap=no ;;
+esac
+
 if test "$have_mmap" = "no"; then
  VIEW_FILE=read.lo
  ALLOC_FILE=alloc.lo

src/libbacktrace/configure.ac

@@ -283,6 +283,12 @@ else
  AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no])
  fi
 fi
+
+case "${host_os}" in
+darwin*)
+ have_mmap=no ;;
+esac
+
 if test "$have_mmap" = "no"; then
  VIEW_FILE=read.lo
  ALLOC_FILE=alloc.lo

src/test/run-pass/issue-45731.rs

@@ -0,0 +1,34 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags:--test -g
+
+use std::{env, panic, fs};
+
+#[cfg(target_os = "macos")]
+#[test]
+fn simple_test() {
+ // Find our dSYM and replace the DWARF binary with an empty file
+ let mut dsym_path = env::current_exe().unwrap();
+ let executable_name = dsym_path.file_name().unwrap().to_str().unwrap().to_string();
+ assert!(dsym_path.pop()); // Pop executable
+ dsym_path.push(format!("{}.dSYM/Contents/Resources/DWARF/{0}", executable_name));
+ {
+ let file = fs::OpenOptions::new().read(false).write(true).truncate(true).create(false)
+ .open(&dsym_path).unwrap();
+ }
+
+ env::set_var("RUST_BACKTRACE", "1");
+
+ // We don't need to die of panic, just trigger a backtrace
+ let _ = panic::catch_unwind(|| {
+ assert!(false);
+ });
+}